burnout

noun7

1. •
   The experience of long-term exhaustion and diminished interest, especially in one's career.
2. •
   A person who has the experience of long-term exhaustion and diminished interest.

   • Ten years of this soul-sucking job would turn any ambitious young person into a burnout.
3. •
   A feeling of being overwhelmed and exhausted from stress and overwork, rendering one cynical, uncaring or depression.
4. •
   The failure of an electrical device, usually through overheating due to the application of excessive power.
5. •
   (US, slang) Someone whose brains have figuratively been burned out by drugs.

   • There’s no way we can hire that guy. He’s a total burnout—he can't do the work.
6. •
   Use of the throttle to spin the wheels of a vehicle being held stationary, causing the spinning tires to produce smoke and burn rubber.
7. •
   The shutoff of a rocket motor after exhausting its fuel or having been irreversibly throttled after the application of a planned delta-v.